add address resolve field to register sub-domain

app/components/ens/registerSubDomain.js

@@ -1,3 +1,4 @@
+import web3 from "Embark/web3"
 import ENSSubdomainRegistry from 'Embark/contracts/ENSSubdomainRegistry';
 import ENSRegistry from 'Embark/contracts/ENSRegistry';
 import React, { Fragment } from 'react';
@@ -36,20 +37,36 @@ const InnerForm = ({
       onBlur={handleBlur}
       value={values.domainName}
     />
+    <FieldGroup
+      id="address"
+      name="address"
+      type="text"
+      label="Address domain resolves to"
+      onChange={handleChange}
+      onBlur={handleBlur}
+      value={values.address}
+      error={errors.address}
+    />
     <Button bsStyle="primary" type="submit" disabled={isSubmitting || !!Object.keys(errors).length}>{!isSubmitting ? 'Submit' : 'Submitting to the Blockchain - (this may take awhile)'}</Button>
   </form>
 )
 
 const RegisterSubDomain = withFormik({
   mapPropsToValues: props => ({ subDomain: '', domainName: '' }),
+  validate(values) {
+    const errors = {};
+    const { address } = values;
+    if (address && !web3.utils.isAddress(address)) errors.address = 'Not a valid address'
+    return errors;
+  },
   handleSubmit(values, { setSubmitting }) {
-    const { subDomain, domainName } = values;
-    const { soliditySha3 } = window.web3.utils;
+    const { subDomain, domainName, address } = values;
+    const { soliditySha3 } = web3.utils;
     const { methods: { register } } = ENSSubdomainRegistry;
     register(
       soliditySha3(subDomain),
       hash(domainName),
-      zeroAddress,
+      address || zeroAddress,
       zeroBytes32,
       zeroBytes32
     )